Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
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Fundamental Study on Rock Cutting by an Actuated Undercutting Disc

구동형 언더커팅 디스크에 의한 암석절삭에 관한 기초연구

  • Received : 2020.12.15
  • Accepted : 2020.12.21
  • Published : 2020.12.31
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Abstract

Several alternative rock-cutting concepts, which are modified from the conventional ones, have been developed lately. Of the concepts, undercutting is one of the latest technologies. In this study, as a fundamental study on the undercutting technique, the rock-cutting mechanism and important parameters of the undercutting were introduced. This study built up cutting test system for evaluating the cutting performance of an actuated undercutting disc cutter (ADC), and carried out a series of cutting tests under different cutting parameters of ADC. The characteristics of cutter forces obtained from ADC rock-cutting tests were analyzed. The both average and peak values of the three directional cutter forces were linearly increased with the increases of linear velocity, penetration depth in vertical direction and eccentricity of ADC.

기존의 전통적인 암석절삭방식의 한계점을 극복하고자 다양한 신개념의 암석절삭메커니즘이 연구되고 있으며, 그 중 언더커팅은 최근 연구가 수행되고 있는 기술이다. 본 논문에서는 언더커팅에 대한 기초연구로서 구동형 언더커팅에 의한 암석절삭메커니즘과 절삭에 관여하는 중요핵심변수들에 대하여 소개하였다. 구동형 언더커팅에 의한 절삭성능을 평가하기 위한 시험시스템을 구축하고 이를 활용하여 주요 핵심변수들을 변화시켜가며 구동형 언더커팅 디스크를 활용한 절삭시험을 수행하였다. 구동형 언더커팅 절삭시험으로부터 획득되는 3방향 커터작용력의 특성을 분석하였으며, ADC의 주요 절삭변수인 선형 이동속도, 법선압입깊이, 편심의 증가에 따라 3방향 커터작용력의 평균값과 최댓값은 모두 선형적으로 증가하는 결과를 나타내었다.

Keywords

References

  1. Bilgin, N., M.A. Demircin, H. Copur, C. Balci, H. Tuncdemir, and N. Akcin, 2006, Dominant rock properties affecting the performance of conical cutters and the comparison of some experimental and theoretical results, Int. J. Rock Mech. Min. Sci. 43, 139-156. https://doi.org/10.1016/j.ijrmms.2005.04.009
  2. Cho, J., S. Jeon, S. Yu, and S. Chang, 2010, Optimum spacing of TBM disc cutters: A numerical simulation using the three-dimensional dynamic fracturing method, Tunn. Undergr. Sp. Tech. 25.3, 230-244. https://doi.org/10.1016/j.tust.2009.11.007
  3. Copur, H., N. Bilgin, C. Balci, D. Tumac, and E. Avunduk, 2017, Effects of different cutting patterns and experimental conditions on the Performance of a Conical Drag Tool, Rock Mech. and Rock Eng. 50, 1585-1609. https://doi.org/10.1007/s00603-017-1172-8
  4. Dehkhoda, S. and E. Detournay, 2017, Mechanics of actuated disc cutting. Rock Mechanics and Rock Engineering, 50.2, 465-483. https://doi.org/10.1007/s00603-016-1121-y
  5. Dehkhoda, S. and B. Hill, 2019, Clearance angle and evolution of depth of cut in actuated disc cutting, J. Rock Mech. Geotech. Eng. 11, 644-658. https://doi.org/10.1016/j.jrmge.2018.12.010
  6. Dehkhoda, S. and E. Detournay, 2019, Rock cutting experiments with an Actuated Disc, Rock Mech. and Rock. Eng. 52, 3443-3458. https://doi.org/10.1007/s00603-019-01767-y
  7. Gospodarczyk, P., K. Kotwica, and G., Stopka, 2013, A new generation mining head with disc tool of complex trajectory, Arch. Min. Sci. 58.4, 985-1006.
  8. Jeong, H. and S. Jeon, 2018, Characteristic of size distribution of rock chip produced by rock cutting with a pick cutter, Geomech. Eng. 15.3, 811-822. https://doi.org/10.12989/GAE.2018.15.3.811
  9. Jeong, H., S. Choi, and S. Jeon, 2019, Current status of rock cutting technique using undercutting concept, Tunn. Undergr. Sp. 29.3, 148-156. https://doi.org/10.7474/TUS.2019.29.3.148
  10. Jeong, H., S. Choi, and S. Jeon, 2020, Effect of skew angle on the cutting performance and cutting stability of point-attack type picks, Tunn. Undergr. Sp. Tech. 103, 103507. https://doi.org/10.1016/j.tust.2020.103507
  11. Kovalyshen, Y., 2015, Analytical model of oscillatory disc cutting, Int. J. Rock Mech. Min. Sci. 77, 378-383. https://doi.org/10.1016/j.ijrmms.2015.04.015
  12. Nishimatsu, M., 1979, On the effect of tool velocity in rock cutting, In: International conference on mining machinery, Brisbane, Australia, 2-6 July, 314-319.